Which of the Following Statements About Ladder Placement Is MOST

Which of the following statements about ladder placement is MOST accurate?

A) Between the ladder and ground, the desired angle of inclination is about 45 degrees.
B) If the butt is placed too far from the building, the weight of a person tends to cause the tip to pull away from the building.
C) An easy way to determine the proper distance between the butt and the building is to divide the working length of the ladder by four.
D) When the ladder is at the proper angle, a firefighter standing straight on the bottom rung should be able to rest an elbow on the rung directly in front.